Question

State most stable oxidation state of manganese and iron? Why is it stable?

Answer 1

$M{n}^{2+}:\left[Ar\right]4s^{0}3d^5⟶$ Half filled $3d$ orbitals.

Hence, most stable oxidation state of $Mn$ is $+2$

Again $F{e}^{3+}:\left[Ar\right]4s^{0}3d^5⟶$ Half filled $3d$ orbitals.

Hence, most stable oxidation state of $Fe$ is $+3$